Yunakovius orientalis, Borovec, 2010

Borovec, Roman, 2010, A taxonomic study of Eastern Palaearctic Omiini (Coleoptera: Curculionidae: Entiminae), Acta Entomologica Musei Nationalis Pragae 50 (2), pp. 577-594 : 582-584

Yunakovius orientalis sp. nov.

( Figs. 1‒7 , 23 )

Type material. HOLOTYPE: 1♀, ‘ Russia, Primorskiy Terr., Lazovskiy Res., Proselochnyi cordon, nr.Tumannaya Mt., 7 km SW Glazkovka Vill., 13.07.2005, K. Nadein (lgt.)’ ( ZIN). PARATYPES: 20 ♀♀, same data as holotype; 13 ♀♀, ‘ Russia, Primorskiy Terr., Lazovskiy Res., nr. Tumannaya Mt., 7 km SW Glazkovka Vill., 43 01 03 N, 134 07 27 E, 10.07.2005, K. Nadein (lgt.)’ (11 ♀♀ ZIN, 2♀♀ ECRI); 1♀, ‘ Russia, Primorskiy Terr., Lazovskiy Res., between Proselochnyi cordon and Glazkovka Vill., meadow, 43 01 03 N, 134 07 27 E, 11.07.2005, K. Nadein (lgt.)’, ( ZIN); 1 ♀, ‘ Russia, Primorskiy Terr., Lazovskiy Res., between Proselochnyi cordon and Glazkovka Vill., 43 01 03 N, 134 07 27 E, 7.07.2005, underbrush in deciduous forest, Quercus mongolica , Alnus sp. , Juniperus manchurica , Betula spp. , Salix spp. , K. Nadein (lgt.)’ ( ZIN); 4 ♀♀, ‘Приморье, ЛaЗовский р- н, окр. пос. ПреобраЖение, 15.-17.VII.2002, в почвенной ловушке, Р. В. Филимонов (lgt.)’ [= Primorie, Lazovskiy distr., environs of village Preobrazhenie,

in soil trap, R. V. Filimonov] ( ZIN) ; 1 ♀, ‘ Russian Far East, Primorskij kraj, Ussurijskij Rayon , Kamenushka , 27.VII.-3.VIII.1992, leg. V. Karasjov’ ( RBSC) ; 6♀♀, ‘ Sibiria or., Primorskij kraj, O. Šauša leg., Arsenev env., 27.v.- 5.vii.1991 ’ ( MKBC) ; 1 ♀, ‘МонголиЯ, Вост. Аймак, р. Нумръегии- Гол., 32 км ЮВ г. Салхит, 24.VII.(1)971, Г. Медведев (lgt.)’ [= Mongolia, Eastern Aimak, river Numregii , 32 km southerneast of town Salkhit, G. Medvedev] ( ZIN) ; 1 ♀, ‘ China, C. Shanxi, 15 km S Pingyao , 37.1 N, 112.2 E, 7. VI.2000, Jaroslav Turna leg.’ ( RBSC) ; 1 ♀, ‘ China, Fenanina env., NW slope of Yunwu Shan , alt. 1200 m, 3.6.2000, Zdeněk Jindra leg.’ ( PKSC) .

Description. Body length (rostrum excluded): 2.68‒3.52 mm (holotype 3.15 mm).

Entire body dark brownish, antennae and legs visibly lighter, reddish brown. Elytra on each interval with one irregular, dense row of erect, yellowish brown piliform setae, about as long as the interval width and with 2‒3 irregular rows of semiadherent, yellowish brown piliform setae, distinctly shorter than half of the width of the interval. Each puncture of elytral striae with one short seta inside. Pronotum and head with only adherent setae, similar to the elytral ones, only somewhat shorter, pronotal setae transversally directed to midline ( Fig. 23 ).

Rostrum very short and wide, 1.61‒1.80 times as wide as long, visibly tapering anteriad with feebly concave sides, at base 1.13‒1.17 times wider than at the apex. Epifrons strikingly tapering posteriad, at interocular space about as wide as a third of the rostral width in the same place, with slightly concave sides and with a shallow, longitudinal furrow anteriorly ( Fig. 1 ). Head and rostrum matt, densely punctate, distance between punctures significantly shorter than their diameter. Only the frons with smaller punctures, somewhat shiny. Interocular space with small fovea.

Antennal scape short, visibly curved in the middle, regularly enlarged in anterior half, at apex slightly narrower than antennal club. Antennomere 1 long, twice as long as wide and 1.3‒1.4 times as long as antennomere 2. Antennomeres 3‒6 1.3‒1.4 times as wide as long, antennomere 7 1.5 times as wide as long.

Pronotum 1.14‒1.21 times as wide as long, widest at midlength, anteriad only slightly more tapering than posteriad ( Fig. 3 ). Dorsal surface densely punctate with punctures only slightly larger than the punctures of the head, distance between punctures shorter than their diameter, with very small and fine punctures between large punctures ( Fig. 23 ). Pronotum in lateral view vaulted.

Elytra 1.33‒1.46 times as long as wide, with feebly arched base ( Fig. 3 ), shiny. Striae wide, about a third of the width of an elytral interval, punctate, punctures significantly larger than the pronotal punctures ( Fig. 23 ).

Tarsi long and slender. Protarsomere 2 1.3‒1.4 times as wide as long, protarsomere 3 1.6 times as wide as long and 1.4‒1.5 times as wide as protarsomere 2; ungular protarsomere 1.6 times as long as protarsomere 3. Metatarsomere 2 1.2‒1.3 times as wide as long, metatarsomere 3 1.6 times as wide as long and 1.3 times as wide as metatarsomere 2; ungular metatarsomere 1.8 times as long as metatarsomere 3.

Female genitalia. Sternum 8 with narrow umbrella-shaped plate, feebly sclerotised, apodeme apically contiguous ( Fig. 7 ). Ovipositor long and slender, tapered apicad ( Fig. 6 ). Spermatheca with slender cornu, corpus large, nodulus and ramus short, ramus somewhat wider and longer than nodulus ( Fig. 5 ).

Differential diagnosis. Same as of the genus Yunakovius gen. nov. (see above). Yunakovius orientalis sp. nov. is the only known species of the genus.

Etymology. Orientalis , -is, -e, a Latin adjective meaning ‘eastern’, referring to the distribution of the species.

Biology. Unknown. Part of the material from the Russian Far East was collected in forest and also by pitfall traps.

Distribution. China (Shanxi, Hebei), Russian Far East, Mongolia.

Figures

Figs. 1–13. 1–7 – Yunakovius orientalis gen. & sp. nov., holotype. 1 – head and rostrum, dorsal view; 2 – head and rostrum, lateral view (scale = 0.50 mm); 3 – pronotum and elytra in female, dorsal view (scale = 1.00 mm); 4 – abdominal ventrites (scale = 1.00 mm); 5 – spermatheca (scale = 0.25 mm); 6 – ovipositor (scale = 0.25 mm); 7 – sternum 8 in female (scale = 0.50 mm). 8–13 – Asphalmus japonicus Sharp, 1896, Japan. 8 – head and rostrum, dorsal view; 9 – head and rostrum, lateral view (scale = 0.50 mm); 10 – pronotum and elytra in male, dorsal view; 11 – pronotum and elytra in female, dorsal view (scale = 1.00 mm); 12 – abdominal ventrites (scale = 1.00 mm); 13 – aedeagus, ventral and lateral view (scale = 0.25 mm).

Figs. 23–26. Habitus. 23 – Yunakovius orientalis gen. & sp. nov. (paratype ♀, 3.1 mm, ZIN); 24 – Asphalmus japonicus Sharp, 1896 (♂, 3.8 mm, BMNH); 25 – A. ovatus (Sharp, 1896) (♂, 3.4 mm, BMNH); 26 – A. sharpi sp. nov. (holotype ♂, 3.0 mm, BMNH).